Grinding or crushing head.



' No. 700,526. I v Patented ma 20, 1902..

- I v-. w. mason, In.

GRINDING OBgCRUSHlNG HEAD.

(Application filed 4p; 26, 1901.)

(No Iodal.)

Witness e3:

ms PETERS 00., FNQYO-LITHO" WASHINGTON n c UNYiTEn STATES PATENT OFFICE.

VOLNEY vv;;MAso T*-,' JR., on NEW YORK, N. Y.

on]NotNe-oaoRUsi-imo HEAD.

SPECIFICA'TTON forminglpart of IlettersPatent N'o. 700,5 26,'dat ed May 20, 71902. A plicationfile d April 26, 1901. SarialNo. 57,-60'7. (N mcaeili embodied insaid application the core was shown asfconical and the segments tapering or wedge-shaped from end toend. The segments were dovetailed'to the core and were securedby'suitalole means. The tapering or wedge-shaped segments were driven onto the core in a direction from the larger toward the smaller end thereof. In' some instances I find it is preferable to drive the segments onto the core from the smaller toward the larger I abntted together.

end; and this invention has for its object to improve the construction of a grinding or crushing head having conical core and a numberof segments thereon, to the end that the segments may be driven onto the core in a' direction from its smaller toward its larger end.

In accordance with this invention the core is formed or provided with a number oflon- .gitudinal dovetailed grooves or recesses extending from the top or smaller end to apoint near the bottom or larger end," the lower ends 'of said grooves or recesses terminating ab; ruptly and forming abuttingshould ers. Two

:sets of segments are provided, the segments of one set being made wider atthe bottom' than at the top and the segments of the other set being made wider at the top than at ..the' bottom. Each segment has formed or pro vided'on'it's inner side a longitudinal dove-' tailed rib adapted to enter and fit snugly one are alternately arranged on the core and The dovetailed grooves or recesses and also the correspondingly-shaped ribs are preferably made tapering from end to end-as, for instance, from top to bottom of the core. When the segments are driven onto the core, the lower ends of the ribs will abut against the abutting shoulders provided 'at the lower ends of the grooves or recesses.

Means are provided for securing the several segments in position after they have been driven onto the core.

Figure 1 shows in plan view and partial section a grinding or crushing head emb odying this invention. section of the same, taken on the dotted line 2 2, Fig. 1. Fig. 3 is a side elevation of the Fig. 2 is a vertical core with segments removed. Figs. 4 and 5 are details of one of the segments of one set. Figs. 6 and 7 are details of one of the segments of the other set.

The core a, herein shown for the sake of illustrating my invention, is madeconical and also hollow and may becorn posed of ordinary steel or cast-iron or any other suitable metal. The core is formed or provided with a number of external dovetailed grooves or recesses a,'extending from the to or smaller end to a point near the bottom or larger end of the core,the lower end of each groove or recess formingj an abutting shoulder near the bottom of the core. These grooves or recesses are all'made a little wider at the top than at the bottom; Every other groove or recessis formed or provided near its lower end with a transverse key-receiving recess 0?, which crosses the groove or recess at substantially a has an entrance at thereto at the bottomof the core, through which keys a may be introduced to said key-receiving recesses a".

12 represents one of the segments of one set, and 'e represents one of the segments of the right angles, and each key-receiving recessother set, there being two setsof differentlyshaped segments herein provided, and it is intended to make said segments of manga- V nese steel.

The segments 1) are made wider at the bottomthan at the top and are provided upon their inner sides each with ajdovetailed rib b, exteiiding from the topto a point near the bottom and shapedto 'correspond to the grooves or recesses formed or provided in the core. These 'segmentsghare driven onto the core in a direction from the top or smaller end toward the bottom until the lower ends of the ribs 1) abut against the abutting shoulders formed or provided at the lower ends of the grooves or recesses a.

are driven onto said core.

' W on the core.

IO their inner sides each with a dovetailed rib 8, extending from the top to a point near the bottom and shaped to correspond to the grooves or recesses a, formed or provided in the core. At a point near the bottom of each 15 segment 6 a key-receiving recess e is formed or provided, which crosses the rib c at substantially right angles and which is adapted to be disposed opposite one of the key-receiving recesses a in the core when the segments The dovetailed rib e is made wider at the top than at the .bottom, and when the segment is driven onto the core the lower end of said rib abuts against the abutting shoulder formed or provided at the lower end of the groove or recess a in the core.

\Vedge-shaped keys (t a are inserted through the opening 00 and properly placed in the key-receiving recesses in substantially o horizontal position, being thereby transversely-disposed relative to the ribs 6. Said keys lock the segments against displacement After the keys at a have been introduced the openings a are closed by .35 pouring molten zinc or any other suitable metal thereinto, which serves to not only close said opening, but primarily to hold the keys a a securely in place.

The segments 6 will be driven onto the core o alternately relative to the segments 1), and

when properly disposed thereon will abut against the segments 6 and inclose the core. Itwill be seen that keys are provided only for the segments (2; but if deemed necessary they may also be provided for the segments In case it is desired to remove the segments or any of them the zinc and the keys will be removed, and then the segment or segments may be driven off of the core.

By providing the core with tapered dovetailed grooves and the segments with taperingdovetailed ribs fitting said grooves I find in practice that when said segments are made of manganese steel the tendency due to the ductility or flow of the metal is for the abut- ,ting sides of the segments to crowd together or against each other and overlap more or less, resulting from the stress or impact or duty performed by them, and such action,

, while tending to draw the segments away from the core, acts to more firmly and permanently lock them to the core.

The means herein shown for attaching the segments to the core I do not herein broadly claim, as the same is contained in my application, Serial No. 56,358, before referred to.

l claim- 1. A grinding or crushing head comprising a conical core having a number of dovetailed grooves extending from the top to a point near the bottom each having an abutting shoulder at its lower end, a'set of external segments, made wider at the bottom than at the top, placed on said core and having longitudinal dovetailed ribs fitting the dovetailed grooves in the core, and another set of external segments, made wider at the top than at the bottom, placed on said core and having longitudinal dovetailed ribs fitting the dovetailed grooves of the core, the several segments of said sets being alternately disposed about the core, and abutted together, and the lower ends of the ribs abutted against the abutting shoulders at the lower ends of the grooves, substantially as described.

2. A grinding or crushing head comprising a conical core having a number of dovetailed grooves extending from the top' to apoint near the bottom, made wider attheir upper ends than at their lower ends andhaving an abutting shoulder at their lower ends, a set of external segments, made wider at the bottom than at the top, placed on said core and havinglongitudinal dovetailed ribs fitting the dovetailed grooves in the core and another set of external segments, made wider at the top than at the bottom, placedon said core and having longitudinal dovetailed ribs fitting the dovetailed grooves in the core, the several segments of said set being longitudinally disposed about the core and abutted together, and the lower ends of the ribsabutted against the abutting shoulders atthe lower ends of the grooves,su'bstantiallyas described.

3. A grinding or crushing headcomprising a conical core having a number of dovetailed grooves extending from the top t'o -a point near the bottom each having an abutting shoulder at its lower end, asetofexternal segments, made wider at the bottom than at the top, placed on said core and having longitudinal dovetailed ribs fitting the dovetailed grooves in the core, and another set of external segments, made wider at the top than at the bottom, placed on said core, and having longitudinal dovetailed ribs fitting the dovetailed grooves of thecore, theseveral segments of said set being alternately disposed about the core and abuttedtogether, and the lower ends of the ribs abutted against the abutting shoulders at the lower ends of the grooves, and means for locking one set of external segments to the core,substantially as described. i

4:. A grinding or crushing head comprising a conical core having a number of dovetailed grooves extending from the top to a point near the bottom each having an abutting shoulder at its lower end, a set of external segments, made wider at the bottom than at the top, placed on said core and having longitudinal dovetailed ribs fitting the dovetailed grooves in the core, and another set'of external segments, made wider at the top the grooves, and transversely-disposed keys interposed between the segments and-core for locking said segments to the core, substantially as described;

5, A grinding or crushing head com-prising a conical core havinga number of dovetailed grooves extending from the topto apoint near the bottom each having an abutting shoulder at its lower end, a set of external seg-' ments, made wider at the bottom than at the top, placed on said core and having longitudinaldovetailed ribs fitting the dovetailed grooves in the core, and another set of external segments, made wider at the top than at the bottom, placed on said core and having longitudinal dovetailed ribs fitting the dovetailed grooves of the core, the several segments of said sets being alternately disposed about the core and abutt'ed together, and the lower ends of the ribs abutted against the abutting shoulders at the lower ends of the grooves, transversely-disposed keys interposedbetween the segments and core for locking said segments to the core, and means for holding said keys in place, substantially as tained insaid key-receiving recesses, and I means for closing the entrances tosaid keydescribed.

6. A grinding or crushinghead comprising a conical core having a number of dovetailed grooves extending from the top to a point near the bottom each having an abutting shoulder at its lowerend, key-receiving re 'cesses crossing alternate grooves'provided with entrances thereto, aset of external seg- 1nents,.made wider at the bottom than at the top, placed on said core and having longitudinal vdovetailed ribs fitting the dovetailed groovesof .the core, and another set of exter- Dal-segments, made wider at thetop'than at the bottom, placedon said core and also having longitudinal dovetailed ribsrfitting the dovetailed grooves of thecore, the several segv men ts'of said sets being-alternately disposed about the eoreand abutted together, and thelower ends of the ribs abutte'd against the 1 abutting shoulders at the lower ends ofthe ,ll

tiallyas described. a v .7. A grinding or crushing head comprising a conicalcore having a number of dovetailed grooves extending from the top to a point near the bottom each having an abutting shoulder at its lower end','key-receiving rewith entrances thereto, a set of external seggrooves, and transversely disposed keyscon= 1 ,tained in said key-receivin g recesses, substane i 1 ments, made wider at the bottom than at the top, placed on said core and having longitudinal dovetailed ribs-fittingthe dovetailed grooves of the core, and another set of exter nal segments, made wider at the top than at the bottom, placed; 011 said core and also hav* ing longitudinal dovetailed 'ribs fitting the dovetailed groovesv of the core, the several segments of. said sets being alternately dis posed about the core and abutted together,

and the lower ends of theribs abutted against the abutting shoulders at the lower ends of the grooves, transversely-disposed keys 'con-.

receiving recesses and for locking the keys in place, substantially as described.- V i y In testimony whereof I have signedmy name to'this specification in'the presenceof 60 cesses crossing alternate grooves provided W 

